Access blocked due to 'invalid' email address? Still getting all emails

Hello,
This has been happening off and on for a couple of months now. I go to TCF, and all but one subscribed threads are blocked, and I get an error message that my email address is invalid and my account suspended until I fix it. The only problem is that my email isn't invalid, it works perfectly fine, and I receive lots of TCF thread notification emails daily. So whatever system TCF is using to send out emails is triggering a false positive on invalid emails that are being sent, being received, and not bouncing back. So I change my email address to another email address (same mailbox, BTW), and then validate that email address via an email... and then things are reset to normal right away. Until a week goes by, I get the same message, and set my email back to the first one. Lather, rinse, repeat. I've been using the same email address on TCF for as long as I can remember. I'd like to get this fixed so I don't have to jump through these hoops every 4-5 days.
Thanks.
-Hank

 

It just happened again.. but the site won't let me reply to this thread or send a PM or do anything else until I updated and confirmed my email address, which I just did so I could post this. As before, I've been getting all emails and notifications to this email address.

 

Can David send me some of the bounce messages or mail errors? I've been using Spamhero.com for spam filtering for several years now, and TCF is on my approved sender whitelist. Between Nov 9 and today, I have 519 approved messages that were sent to me as clean email (no spam or bounce backs). If they were rejected as spam, they would have shown up in my control panel as such.

Below is a screen shot from the last several messages from spamhero. There must be something else Securi is doing to determine my email address is invalid when it's not actually invalid.

The green icon means these are all whitelisted and delivered: